Step 3: Building the Dependencies
Package autoconf is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Unable to locate package build-essential
E: Package 'autoconf' has no installation candidate
E: Unable to locate package automake
E: Unable to locate package libxmu-de
来源： https://www.howtoforge.com/tutorial/ns2-network-simulator-on-ubuntu-14.04/
答案1
ns2 构建先决条件：
sudo apt-get update && sudo apt-get install g++ autoconf make libtool libxmu-dev
## Older Ubuntu's : libtool-bin
（build-essential将安装 g++，make。更容易输入g++ make）
同样有用：sudo apt-get install xgraph